Error: cannot ajaxify WordPress Popular Posts on this theme.

I love this plugin, with its extensive options. I love the developer too.

I tried using it as a widget but i am getting this error.

Error: cannot ajaxify WordPress Popular Posts on this theme. It’s missing the id attribute on before_widget (see register_sidebar for more).

I will be glad you will help me out

This is my site http://www.haveyoursay.ng

Thanks

https://ww.wp.xz.cn/plugins/wordpress-popular-posts/